4线双极性步进电机，其中有c语音变成的源代码调试过的， 有单四拍，双4拍，还有半步8拍方式 还有细分方式，其中有UDN2916应用等多种芯片资料加电路连接原理图-4-wire bipolar stepper motors, which have become the source code c voice debugging off, a single four-beat, double four beats, as well as half-step mode and 8-beat break